`openSessionInNewWindow` → IPC `hermes🪟openSession` →
`buildSessionWindowUrl` emitted no `profile`, so a secondary window (⇧⌘-click
pop-out, subagent watch) was a full renderer that adopted the PRIMARY
backend's profile and resolved the session id against the wrong store —
blank/wrong session for any non-primary profile (#82768, #61286).
The owning profile now rides the URL as `&profile=`, exactly the carry the
HUD already does (buildHudWindowUrl / windowProfileOverride in
use-gateway-boot); the renderer picks it with the same ladder openHud uses:
the session's stamped owner wins, an unstamped/uncached id (a brand-new
subagent child) inherits the profile the user is looking at.
Diagnosis credit: @DomGrieco (#82794).
Co-authored-by: DomGrieco <6556434+DomGrieco@users.noreply.github.com>
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